package collection;
import java.util.ArrayList;
import java.util.Collection;

/**
 * 集合功能: contains()、remove()
 */
public class CollectionDemo2 {
    public static void main(String[] args) {
        Collection c = new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(9,0));
        c.add(new Point(1,2));
        System.out.println(c); //[(1,2), (3,4), (5,6), (7,8), (9,0), (1,2)]

        /*
          boolean contains(Object o):
          判断当前集合是否包含给定元素o
          判断依据是给定元素与当前集合元素是否存在equals()为ture的情况
         */
        Point p = new Point(1,2);
        boolean contains = c.contains(p);
        System.out.println("是否包含:"+contains); //true

        /*
          boolean remove(Object o):-------一般都不接收boolean结果
          从当前集合中删除与给定元素o的equals()比较为true的情况
          若存在重复元素则只删除第1次匹配的元素
         */
        boolean remove = c.remove(p);
        System.out.println("是否删除:"+remove); //true
        System.out.println(c); //[(3,4), (5,6), (7,8), (9,0), (1,2)]

    }
}






















